Animal pictures of the week: 11 January 2013

A Helen's Flying Frog perches on a branch in Nui Ong Nature Reserve in Vietnam's Binh Thuan Province. Australian biologist Jodi Rowley and Vietnamese colleagues have made a surprise discovery - a new species of flying frog gliding and jumping around less than 100 km (62 miles) from one of Southeast Asia's busiest cities. Though discovered in 2009, it has taken until now to identify it for certain as a new species. It has been named Helen's Tree Frog (Rhacophorus helenae) after Rowley's mother, who is suffering from ovarian cancer. She was very excited about having the "charismatic" amphibian named after her.Picture: REUTERS/Australian Museum/Jodi Rowley